YELLING" It's a viral sensation we first reported on last week - and it's still picking up momentum... People with an adventurous- side are taking the plunge to raise money for a very sick baby in Missouri. But tonight a warning from an Iowa sheriff to be careful you don't hurt yourself or break the law. Mark Tauscheck here to explain. This started almost two weeks ago in Tarkio, Missouri - where 5- month old Landon Shaw lives with his family. Landon has stage four brain cancer that has spread rapidly through his body... His battle has spawned a viral phenomenon sweeping the internet ...people's hearts are in the right places, but a warning tonight to not put the rest of their bodies in danger. If you haven't seen the videos yet... HIGH SCHOOL PLUNGE - :06- all jump in ..they are multiplying .... KYLE AND JOSH - :21 - jumping in off dock LANDON PLUNGE - :52- jumping in off dock and that's good news for the family of Landon Shaw... CONGRESSMA N SAM GRAVES STAFF PLUNGES - :51-girls jumping in - since each plunge comes with a promise of a monetary donation if their challenge to another person is accepted... Cold water plunge for landon - :23-"i will donate 30 dollars if matt johnson, head coach of st. Joseph's completes the challenge..." Cold water plunge for landon:56- "wooo! Jumping in" But one woman was injured when she jumped into shallow water at Rapp Park near Shenandoah...a nd to add insult to injury, she was ticketed for tresspassing because swimming is not allowed in that location. 8:12:02-"even though it's cold, doesn't hurt to go out there first and know what's down there - not a good idea to just go to a bank and jump in... .. that can get dangerous very quickly." Sheriff Palmer advises people who want to plunge for Landon to get creative with swimming pools.. LAILA HELPING DADDY - :29- jumping into pool or tubs... PLUNGE FOR LANDON - :24- into tub at work ... or really big tubs... GRUNDY FIREFIGHTERS - :26-pipe opens, water into tank But it's hard to temper the enthusiasm ... FARMER AND WIFE PLUNGE - :08-"the farmer and I are going to jump in!" when Iowans are given a chance to help someone in need... STUART FIRE DEPARTMENT - :16 - off dock CASS COUNTY 9-1-1 - 1:00 - "lets' go!" FARMER AND WIFE PLUNGE - :44-"you guys are going to have to pull us out!" JACOB LANDON YOUTUBE - :35 - falling into mud hole" FARMER AND WIFE PLUNGE - 1:01-"falling into mud together" Farmer and wife Sheriff Palmer down in Clarinda thinks it's a great idea - in fact he took the plunge himself - he just says don't take unneccesary risks and obey the rules... For instance, there has been at least one of these plunges for Landon at Grey's Lake in Des Moines - that's breaking park rules because it doesn't open for swimming until after Memorial Day - and according to Des Moines police it's also breaking the law - city code would require written permission from the city to swim in an unsupervised place out of season. Thanks mark.